(function() {
   document.addEventListener(
      "DOMContentLoaded",
      function() {
         var e = "Referance";///id buraya
         var t = "ref";
         
         var n = document.getElementById(e);
         if (n.getAttribute("href").indexOf("refurl") < 0) {
            var i = n;
            i.href = i.href +(i.href.indexOf("?") === -1 ? "?" : "&") + t +"=example.com";
         }
      },
      false
   );
})();